JP3608109B2 - Electric injection mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric injection mechanism that uses an electric motor to drive a screw.
[0002]
[Problems to be solved by the invention]
A single ball screw is used for an electric injection mechanism that uses an electric motor such as a servo motor as a drive source, converts the rotational movement of the electric motor into linear movement by a ball screw shaft and a ball nut member, and drives the screw to be injected. There are those using a shaft and those using a plurality of ball screw shafts.
[0003]
In any of these types, a screw drive body is inserted into a guide bar between a pair of front and rear plates so as to freely advance and retract, and a ball screw shaft that is rotated by an electric motor is screwed into a ball nut member provided in the screw drive body. ing. The rear end of the screw in the injection heating cylinder attached to the front center of the front plate is rotatably connected to the front center of the screw driver.
[0004]
In such a configuration, when the core of the injection heating cylinder and the core of the screw drive body are slightly shifted and assembled, the injection heating cylinder and the screw inside thereof are also misaligned, causing biting or breakage, and the screw. The parallelism with the guide bar that supports the drive unit is also distorted, and the sliding resistance increases with respect to the movement of the screw drive unit, which causes control problems and troubles. Easy to do.
[0005]
The cores of the injection heating cylinder and the screw drive body are determined by the processing accuracy and assembly accuracy of each member constituting the injection mechanism, and it is extremely difficult to adjust the misalignment after the assembly is completed. However, most of the misalignment is likely to occur in the height direction due to the influence of the load, and the misalignment during operation is caused by the deflection of the guide bar due to the load of the screw drive body. If the height of the screw driver can be adjusted by any means, most of the inconvenience due to misalignment can be solved.
[0006]
The present invention has been conceived from the above circumstances, and its purpose is to enable the height adjustment of the screw drive body to be adjusted by an extremely simple means after assembly, and to align the injection heating cylinder and the screw drive body. It is an object of the present invention to provide a new electric injection mechanism that can be easily performed and can prevent misalignment during operation.
[0007]
[Means for Solving the Problems]
According to the above-described object, the present invention provides a front plate having a screw-injection injection heating cylinder at the front center, a rear plate having an electric motor for injection driving, an installation member to which both plates are fixed, and a pair of front and rear thereof. A plurality of guide bars that are connected to the plate and provided on the left and right sides of the plates, a screw drive body that is inserted through the guide bar and is freely movable between the plates, and is provided on both sides of the screw drive body. Each of which is screwed with the ball nut member, and comprises a driving means by a pair of ball screw shafts arranged in a rotatable manner across the front plate and the rear plate,
The injection heating cylinder and the screw driving member centering member provided on both lower sides of the screw driving member between the installation member and slidably supporting the screw driving member and provided with height adjusting means. It is to be provided.
[0008]
Further, the installation member is formed of a board body fitted and laid on the upper surface of the base, and the centering member is provided between both upper surface sides of the installation member and the screw driving body.
[0009]
Further, the centering member is made up of a pair of wedge-shaped members that are alternately superposed with the contact surfaces formed into inclined surfaces, both of which are relatively movably connected by an adjusting screw, one of which is the screw. It is fixed to the lower surface of the driving body, and the other is placed on the upper surface of the installation member.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In the figure, reference numeral 1 denotes a front plate, 2 denotes a rear plate, and the front plate 1 includes an injection heating cylinder 4 in which an injection screw 3 is rotatably and reciprocally mounted at the front center, and the rear plate 2 is injected by a servo motor or the like. An electric motor 5 for driving is provided.
[0011]
The pair of front and rear plates 1 and 2 are fixed to an installation member 7 laid on the upper surface of the base 8 of the machine base 9 with the four corners connected by guide bars 6 and 6. This installation member 7 consists of a board | plate body, and is fitted and laid by the upper surface of the base | substrate 8 formed in the concave surface.
[0012]
A screw driver 10 is inserted into the guide bars 6 and 6 at the four corners and is disposed between the front and rear plates 1 and 2 so as to be able to advance and retract. Ends are rotatably connected. A pair of ball nut members 12 and 12 are integrally provided in the center of the left and right sides of the screw driver 10. A pair of ball screw shafts 11 and 11 that are rotatably supported in parallel over the front plate 1 and the rear plate 2 are screwed to the ball nut members 12 and 12, respectively.
Although not shown in the drawing, the screw driver 10 is provided with an electric motor for measuring materials and a screw rotating mechanism.
[0013]
A pulley 13 is attached to the outer end portion of the rear plate 2 of the ball screw shaft 11, and a timing belt 15 is wound around the pulley 13 and the pulley 14 of the electric motor 5. Thereby, the ball screw shaft 11 is rotated by the electric motor 5, and the rotational motion is converted into a linear motion by the ball nut member 12, and the screw driver 10 is driven forward together with the screw 3, so that the injection heating cylinder 4 The metered resin is injected into the front part.
[0014]
Reference numeral 16 denotes a centering member for the injection heating cylinder 4 and the screw driver 10, which is composed of a pair of wedge-shaped members that are alternately superposed with their contact surfaces formed into inclined surfaces, both of which are relatively movable. It is connected by a side adjusting screw 17.
[0015]
One of the centering members 16 is fixed to the lower surface inside the guide bar of the screw driver 10 as an upper member 16a, and the other is mounted on the upper surfaces of both sides of the installation member 7 as lower members 16b. Is adjusted by the rotation of the adjusting screw 17 to change the height of the screw driver 10 together with the guide bars 6 and 6 so that the injection heating cylinder 4 and the screw driver 10 can be aligned.
[0016]
When the centering member 16 is attached, sliding plates 18 are laid on the upper surfaces of both sides of the installation member 7, and the lower member 16 b is placed thereon, and the lower sides of the screw driver 10 are always supported by the installation member 7. Even in this state, it is preferable that the advancing and retreating drive occurs smoothly so that the height adjustment position by the core alignment member 16 is maintained even during operation.
[0017]
In addition, as the screw driver 10 is increased in size, the centering member 16 is preferably attached to the rear part as shown in the figure, and the height adjustment and support of the screw driver 10 are preferably performed at the four front and rear positions. .
[0018]
In the above configuration, even if the electric injection mechanism is provided with a biaxial drive means using a pair of ball screw shafts, the height of the screw drive body 10 can be adjusted even after assembly by attaching the centering member 16. Therefore, the left and right or front / rear / left / right centering members 16, 16 are individually connected even when centering of the injection heating cylinder 4 and the screw driver 10 is required due to the processing accuracy and assembly state of the injection mechanism. The operation can be easily performed only by adjusting the height position of the screw driver 10 by operating.
[0019]
Further, when the wedge-shaped upper and lower members 16a and 16b are used as the centering member 16, the structure is very simple and the mounting is easy, and the height adjustment is also possible by the rotation of the screw. Since it can be performed by changing, even a slight misalignment can be corrected.
[0020]
Furthermore, since both sides of the screw driver 10 are grounded to the machine base by the centering member 16, the load on the screw driver side is shared by both the guide bar 6 and the centering member 16. As a result, misalignment caused by bending due to the load of the guide bar 6 is also prevented.
[Brief description of the drawings]
FIG. 1 is a side view showing a cross section of a part of an electric injection mechanism according to the present invention.
FIG. 2 is a sectional view taken along line AA of the above.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Front plate 2 Rear plate 3 Screw 4 Injection heating cylinder 5 Electric motor 6 Guide bar 7 Installation member 8 Base 9 Machine base 10 Screw drive body 11 Ball screw shaft 12 Ball nut member 16 Centering member 16a Upper member 16b Lower member 17 Adjustment screw

Claims (3)

A front plate provided with a screw-injection injection heating cylinder in the center of the front part, a rear plate provided with an electric motor for driving the injection, an installation member fixed to both plates, and a pair of front and rear plates connected to the plate A plurality of guide bars provided on the left and right sides, a screw drive body that is inserted through the guide bar and disposed between the plates, and a ball nut member that is provided on both sides of the screw drive body. In combination, it comprises a drive means with a pair of ball screw shafts arranged rotatably along the front plate and the rear plate,
The injection heating cylinder and the screw driving member centering member provided on both lower sides of the screw driving member between the installation member and slidably supporting the screw driving member and provided with height adjusting means. An electric injection mechanism characterized by comprising: 2. The installation member according to claim 1, wherein the installation member includes a board body fitted and laid on the upper surface of the base, and the centering member is provided between both upper surface sides of the installation member and the screw driving body. Electric injection mechanism. The centering member is composed of a pair of wedge-shaped members that are alternately superposed with the contact surfaces formed into inclined surfaces, both of which are relatively movably connected by an adjusting screw, and one of them is driven by the screw. The electric injection mechanism according to claim 1 or 2, wherein the electric injection mechanism is fixed to the lower surface of the body and the other is placed on the upper surface of the installation member.

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